Which best describes the respiratory system? A: The respiratory system allows for gas exchange, water and heat balance, and production of sound and speech.
B: The respiratory system allows for gas exchange, heat balance, and secretion of hormones.
C: The respiratory system allows for water and heat balance, prevention of disease, and creation of sound and speech.
D:The respiratory system allows for water balance, muscular support, and passage for ingesting food.

During sunny hours, a large amount of build up between the hours of 1: 00-5: 00 pm. a. ozone b. mercury c. lead d. sulfuric acid

Elephants in the savanna regions of africa dig holes in dried up river beds to reach water lying just below the surface. these holes provide drinking water for other animals as well. so, without the elephants, many animals might otherwise die from lack of water during the dry season. the location in which the elephants live is an example of a/n and the role they play in creating water holes is an example of a a) ecosystem; habitat b) community; niche c) habitat; niche d) niche; habitat

What is the process of pulling apart an n2 molecule nevermind i got it